Deuterium resembles hydrogen in chemical properties but reacts:

Identify the correct statements from the following:
$I$. $B_2H_6$ is an electron deficient hydride.
$II$. $NH_3$ is an electron rich hydride.
$III$. $NaH$ is a covalent hydride.
$IV$. $YbH_{2.55}$ is an interstitial hydride.

$BF_3$ reacts with $NaH$ at $450 \ K$ to form $NaF$ and $X$. When $X$ reacts with $LiH$ in diethyl ether,$Y$ is formed. What is $Y$?

$B_2H_6 + 2NaH \to$ compound $P$. Identify the hybridisation of Boron in compound $P$.

Which of the following statements about $H_2SO_4$ is incorrect?

Which one of the following would lose weight on exposure to atmosphere?